Fsk - microHAM DIGI KEYER Manual

The microphone gain control then becomes a form of transmit power control.
An initial indication of proper audio drive level can be seen on the ALC meter of the radio. Provided
that there is NO audio processing in circuit and that the microphone gain control is in its normal
operating position, then, if the ALC does not show or just starts to indicate during transmission, the
signal is likely to be clean. It is also important is to turn off the microphone compressor, ANY transmit
audio equalizer, AND transmit DSP when AFSK is used. DO NOT use any form of digital modulation
(sometimes called "Transmit DSP") with AFSK or PSK. Some transceivers bypass these circuits
automatically when signal is routed to the rear audio jack instead of the microphone jack, but some do
not (for example, the TS-850).
Whenever possible, if your transceiver supports FSK, use FSK for RTTY. It's a only sure way to get
a clean RTTY signal no matter the gain setting and compressor (processor) setting on your radio.
When a COM port is assigned to the FSK channel
in Router but not in the application program (or no
application is running), Router shows the channel
as closed.
When an application opens the COM port (usually at start-up), Router shows channel as open and
displays the baud rate, data bits, parity and number of stop bits in use. For example, 45 5N1.5 means: 45
Baud, 5 data bits, parity = none, 1.5 stop bits.
The virtual port used for FSK can optionally support PTT (required in basic MMTTY settings). Do not
share the FSK port with any other function.
TIP: If you see a baud rate other than 45 baud, the application is not configured correctly for normal
RTTY operation.
FSK data flowing thru the channel are indicated by
green arrow.
To test operation of FSK from the computer to the radio click on Test button with no port assigned or the
port closed. More details about function checks are described in chapter 12.2
The second FSK channel is identical to the primary FSK channel.
The second FSK port is only usefull for radios with two receivers such as the FT-1000D, FT-1000MP,
Mark V, Orion or IC-7800. Audio output from the second receiver is automatically connected to the right
channel of the USB sound processor. The second instance of the RTTY program (for example MMTTY)
should specify "right channel" for its audio source and should be configured to use the 2
FSK output.
microHAM © 2006 All rights reserved
2 nd FSK PORT
18
Edited by Geoff Anderson, G3NPA
nd FSK port for its